We (MasterCoin) have plans for distributed e-commerce too, but I'm a little worried about getting in trouble, since it can be used as a "distributed silk road".
Certainly I would never condone such operations, nor would I ever personally mis-use the software in such a way.
I do think there are legitimate uses for it, which is why it is on our todo list.
Clearly E-Bay is a big example of "legitimate uses", so that point IMO is without question demonstrably true.
Unfortunately I believe they are also ripe for disruption. (See, for example, their abuse of power vis-a-vis their prohibition on Bitcoin-related products.)